I couldn't possibly agree more with you on that topic.
On one hand I can understand that they need to adjust the games for the new generation of aspiring young Pokémon trainers that are picking up the games for the first time or that haven't been playing as long as the vast majority of us, I can also fully understand that the veteran players are wishing for some way of skipping the tutorials on the other hand. The games and their new mechanics and features have continuously become more elaborate and complex, so I can definitely see why new trainers might feel a bit overwhelmed at first and wish to receive further guidance. I'd also like to welcome this opportunity to take this idea even a step further and say that we need two different modes: Easy and Normal. Ultimately I think that the player should be given the opportunity to pick a mode when the local professor introduces himself/herself at the beginning of the game:
Once you've told him/her your name and gender, he/she could ask you about which mode you want to play.
For the sake of argument, let's take Professor Kukui in order to illustrate my aforementioned idea:
"Alola cousin! You look a bit lost to me but no worries, this is to be expected if it's your first adventure."
"This IS your first adventure, right"?
>Yes (Easy Mode)
"No worries, that's what I thought. My colleagues and I are trained professionals to guide aspiring new trainers like you through the trials of this region lickety split."
>No (Normal Mode)
"Welp, it looks like you're a little Prankster and I fell for your Fake Tears there cousin, huh? Hau'kudiu Dudist'umi?"
On that note it'd also be a great idea to adjust the Gym leaders, Kahunas and Elite 4 members, depending on the mode that the player originally chose.
In my honest personal opinion I think that the Pokémon games have been around long enough to the point where there are two generations of trainers with a respective amount of experience and with respective expectations that they need to cater to and where they should leave it up to the respective individual player to pick the difficulty mode of his/her adventure.